It's vague as shit. I understand such move from Facebook (which they did) but in case of PP it might be like frogster wrote. Maybe adverts? Some shitty and poor companies that put some ads on PP site later on stalked by paypals' copyright trolls?
sar·casm | \ ˈsär-ˌka-zəm \
1: a sharp and often satirical or ironic utterance designed to cut or give pain
2a: a mode of satirical wit depending for its effect on bitter, caustic, and often ironic language that is usually directed against an individual
b: the use or language of sarcasm
